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Leases - Supplemental Cash Flow Information (Details)
$ in Millions
3 Months Ended
Jun. 30, 2019
USD ($)
Leases [Abstract]  
Operating cash flows from operating leases $ (99)
Operating cash flows from finance leases 0
Financing cash flows from finance leases (3)
Right-of-use assets obtained in exchange for lease obligations: Operating leases 2,290
Right-of-use assets obtained in exchange for lease obligations: Finance leases $ 55